Finding the Fourth Proportional to 72,018.72, 99,373.95 and 40,187.55

Step by Step Solution

1. Step 1: Write the proportion equation
   72,018.72 : 99,373.95 = 40,187.55 : x
2. Step 2: Convert to fraction form
   72,018.72/99,373.95 = 40,187.55/x
3. Step 3: Cross multiply
   72,018.72x = 99,373.95 × 40,187.55
4. Step 4: Simplify right side
   72,018.72x = 3,993,595,584.32
5. Step 5: Solve for x
   x = 3,993,595,584.32/72,018.72
6. Step 6: Final answer
   x = 55,452.19